To easily and accurately perform the stop or the deceleration control of a conveyor based on an operation amount applied to an operation device without stopping hands even during a manual sorting operation in a waste material sorting treatment system having the conveyor carrying waste material and a drive device driving the conveyor and so formed that at least one worker on at least one side of the conveyor can manually sort prescribed objects to be sorted from the waste material on the conveyor while the conveyor is running.

This waste material sorting treatment system comprises the operation device capable of being arbitrarily operated by the portion Ma of the body of the worker M other than the hands while the worker performs the manual sorting operation, an operation amount detection means SE detecting the operation amount applied to the operation device S, and a control device C controlling the operation of the drive device D so as to stop or decelerate the conveyor based on the detected results of the operation amount detection means SE.